CDatabase bug in MFC in VS2012

After migrating an MFC application from Visual Studio 2008 to Visual Studio 2012 I run into an unexpected error: the application was having problem fetching data from the SQL Server database. After debugging it turned out that function CDatabase::GetConnect that I was using to retrieve the connection string after opening the database (for different purposes)…

A tale of two flags: DS_CONTROL and WS_EX_CONTROLPARENT

I recently ran into problems with an MFC application that was hosting some Windows Form user control in a modal dialog; the application hanged after it lost focus. The problem was the window received WM_GETDLGCODE message in an infinite loop making it impossible to handle anything else. After a lot of digging, I found that…

Sorting a CTreeCtrl

The CTreeCtrl supports several ways to sort its content: InsertItem allows to insert the child item alphabetically, when specifying TVI_SORT for hInsertAfter SortChildren performs an alphabetical sorting of the child items of the given parent item in a tree SortChildrenCB performs a sort with a user-defined callback (hence the CB suffix) of the children of…

File Dialog with Custom Controls

Sometimes you want to customize a file dialog, maybe to provide a preview for images or files in general. Fortunately, the common file dialog can be easily extended to achieve this. I will explain in this post how to do that. There are several things one needs to do to extend the file dialog. First…

.NET out string[] to Automation SAFEARRAY**

.NET allows you to expose components as COM and consume them from unmanaged code. There are many references on how to this (and you can only start with MSDN), and I will not talk about that part. What I want to explain here is something different. Suppose you have this interface:

Method GetUsers() returns…

Task Dialog in MFC

The new MFC library from Visual Studo 2010 supports another Vista specific feature, the task dialog. This is meant as a replacement for the classic dialog box, and can display command links, customized buttons, customized icons, and a footer. Here is an example of such a dialog (from Windows Server 2008). MFC contains a new…

Restart Manager in MFC

One of the new features available in MFC in the Visual Studio 2010 CTP is the Restart Manager. This was introduced with Windows Vista to offer support for restarting application when a crash occurs or when an automatic update needs to close and then restart an application. When you create a new MFC project in…

MFC Feature Pack

At the beginning of January, Microsoft released a beta version of MFC Feature Pack, an exstension to the MFC shipped with Visual Studio 2008. This feature pack allows developers to create applications with the look and feel of Office, Visual Studio and Internet Explorer. MFC application can now support: Office Ribbon Office 2003, XP and…